Working with Imagery in ArcGIS 10 Jennifer Kuntz Overview of Presentation • Imagery Overview • Display “Looks Great, Draws Quickly” - Image Analysis Window - Acceleration • Process - Image Analysis Window (part 2) - Data Extraction • Manage • Serve What is imagery in ArcGIS? Imagery is raster data - Aerial photography - Satellite imagery - Thermal imagery - Digital elevation models - Scanned maps - Land classification - Surfaces created from analysis Adding Imagery and Raster Data • File on disk • Geodatabase Mosaic dataset • Stored like a raster catalog • With more capabilities • Metadata is stored in attributes • User experience like a raster dataset Adding Imagery and Raster Data ArcGIS Online Map Service Image Service WCS / WMS Service Raster Properties • Data source - Type of file and location • Raster information - Information about the pixels • Extent - Top, bottom, left and right extents • Spatial reference - Coordinate system information • Statistics - Min, max, mean, and standard deviation (per band) Raster Datasets - Properties • Pyramids Factor of 2 - Reduced resolution copies of the source - Improve display performance - Support three resample methods - Can be compressed (new) Nearest Bilinear Cubic • set in GeoProcessing environment neighbor interpolation convolution • Statistics Stretched: Unstretched: - Enhance visual display Min: 0 Min: 24 Max: 255 Max: 241 • Build Pyramids and Statistics tool (new) Display Displaying Raster Data • Renderers - Display your data with a renderer that makes your data look good • Image Analysis window - Common capabilities in one easy to access location Stretched renderer • Often used for elevation, satellite and aerial imagery • Default: when raster has more than 25 unique values - Stretches values along a color ramp